IS : 2520 - 1984 (Reaffirmed2005) 1!395) (Reaffirmed Indian Standard SPECIl?ICATION FOR ZINC STEARATE FOR COSMETIC INDUSTRY ( Second Revision ) First Reprint FEBRUARY 1999 UDC 661.847.753 : 665.58 Q Copyright 1984 BUREAU MANAK OF BHAVAN, INDIAN STANDARDS ZAFAR MARG 9 BAHADUR SHAH NEW DELHI 110002 cl-4 November 1984 ' IS I2520-1984 Indian Standard SPECIFICATION FOR ZINC STEARATE FOR COSMETIC INDUSTRY ( Second Revision ) Cosmetics Sectional Committee, PCDC 19 Choirman DB S. S. GOTIWJSKAR Directorate RqWrsnling General of Health Services, New Delhi Maharashtra State, M&S tt.W.ISTAWTDm~cxou FoodBo~bsDy"B Administration, DB P. D. PILANKAU ( Al&mate) Lakm6 Ltd, Eombay SAEI S. M. SHA~~BEAQ( Altamata ) Hindustan Ciba-Geigy Sstm V. G. DESBPANDE Da S. S. KAIMABKAR ( Alternate ) ConsS;reaze;ational DR A, S. DIVATIA SEBJ B. S. BULVE Ltd, Bombay & Research Centre, KUMA~I RANI ADVANI ( Altsmatc ) Johnson & Johnson Ltd, Bombay DB S. N. Ivnx SBBI G. V. BnaNDAnI ( Allarnala ) Lady Irwin College, New Delhi SEBNATI T. JACOB Hindustan Lever Ltd, Bombay DE G. L. MADAX SHRI D. CHHIBBA ( Alfmmfc) Nitional Test House, Calcutta SERI P. MAZ~D~DAR SHRJ P. K. C~AXRABOlrYY ( &eTaalG) DN~S Control Administration, Government of Swr R. C. ME~TA Gujarat, Ahmadabad Smtr J. P. GANATRA ( Alternate ) Millet Rochas Pvt Ltd, Madras SBBI A. M~NHAZUDDIN KUMARI NASRIN BEQAM ( Alternate ) Perfumes & Flavours Association of India, Bombay Dn S. G. PATNEPAP. SBRI SUDIIIR JAIN ( Alternate ) Swastik Household & Industrial Products Pvt Ltd, SHRI K. S. RAO Bombay SHRI C. R. KRISIINA~~OOBTIIY ( Altqnafc ) Indian Soap & Toiletries Makers' Association, SERI A. C. ROY Bombay Central Drugs Laboratory, Calcutta DR S. K. ROY DR A. C. Dns GUPTA ( A&s~~~ata ) ( Conhued on &y 2 ) @ Ca@ri# 1984 BUREAU OF INDIAN STANDARDS This publication is protected under the Its&a 0fl@ Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the puhlishee shall be deemed to be an infringement of copyright tmder the said Act. Manbm SERI P. ROY Representmg Bengal chemical Calcutta & Pharmaceutical Works Ltd, DR A.;N. BAFIU ( Alternate ) SEE1 V. SITARAId Srinr I. SUNDABEEH I Basic Chemicals & Pharmaceuticals & Export Promotion Council, Bombay `Consumer's ( Cosmetics Alternate 1 Guidance Society, Bombay Directorate General of Technical Development, New Delhi SEBI S. N. AOABWAL ( Alternate ) SIERI M. S. SAIEIPA, Director General, IS1 ( Ex-ofio Member ) Director(P&C) SHRIYATI V~JAY MALIK As&ant Director ( P & C ), IS1 SHSI M. S. TRAXVB SEUI N. G. IY~B ( Aftmutr SEBI R. THANJAXU SEBIXATI UBHA SIJKTHA~~AR SHRIYATI USEA KAWEBKAR Alterwe ) ) Godrej Soaps Ltd, Bombay Raw Materials DE G. L. MA~AX and GRAS List Subcommittee, Hindustan Lever Ltd, Bombay PCDC 19 : 1 Members Dr G. L. Madan ) ~OXS~~~IO~R AauumAler .SEBI D. CEHIsBA ( Afternute to Food 8 Drug Bombay Administration, Maharashtra State, ( 2zzz2xTm.m omc!m CnaesI(Cn~~) (A&,) LakmC Ltd, Bombay SHBI B. S. BABVE SBBI S. M. SlIAl'?BHAQ ( Alterwe > ~~~m~~~oi;"ip 14trl, Bofl~y S-1 V. G. I)~~~HPANDE Acinmutra~on, Government of .g . SEEI J. P. GANATBA ularat, Alunadabad S-1 R D. DIEODEAR( Al&m&c ) Johnson h Johnson Ltd. Bombay DBS.N.IYW S-TX USEA R. JOSHI ( Ati ) Swastik Household h Industrial Products Pvt Ltd, SW1 K. S. RAO Bombay S-I C. R. KB~SFRJAU~OO~TI~P( Al&n& ) Sudershan Chemical Industries Ltd, P~FM SE& K. L. RATEI &IBI U. N. LlYAYB ( dUR& ) DF&. K:RoY? DBP. C. BOSE ( Afrmrok ) DE N. D. !%k D~M.h¶.Dortn AlkrncrcI) SEIU NA~OEAI~DBA 6 . SHAH 8~~1 VLIIODOHABIDBA K. MmnTA(`&m-) 8sNA4.8.Tl?AxuB 8~uxN.G.h'xa(~) Central Drug Laboratory, Calcutta Geoffrey Mannera (It Co Ltd, Bombay Devarwns Pvt Ltd, Ahmadabad Godrej Soaps Ltd, Bombay 2 ISr2520.1984 Indian Standard SPECIFICATION FOR ZINC STEARATE FOR COSMETIC INDUSTRY ( Second Revision ) 0. FOREWORD 0.1This Indian Standard ( Second Revision ) was adopted by the Indian Standards Institution on 16 August 1984, after the draft finalized by the Cosmetics Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council. 0.2 This standard was first published in 1963 and subsequently revised in 1977. In the first revision of this standard, two sets of requirements, namely, the essential and the optional requirements had been prescribed. Subsequently this was found non-implementable for certification and therefore the Sectional Committee after due consideration decided to stipulate only a single set of requirement. 0.3 Zinc stearate is used in face powders, after-shave powders; baby powders, foot powders etc, to which it is said to impart improved properties of smoothness and adhesion. It has mild antisepticand astringent properties. It is also used as a local smoothing application in inflammatory and irritating skin diseases and as a water-in-oil emulsifier in hair-grooming preparations. 0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified valuein this standard. 1.SCOPE 1.1This standard prescribes the requirements and *Rules for rounding off numerical values ( rcuiscd ). the methods sampling and test for zinc stearate for cosmetic industry. of 3 IS : 2520 - 1984 2. REQUIREMENTS 2.1 Description - The material shall be in the form of a fine white bulky powder, free f.om rancid odour. It shall be insoluble in alcohol, water and ether. 2.2 The material shall also comply with the requirements given in Table 1, when tested according to the methods prescribed in Appendix A. Reference to the relevant clauses of Appendix A is given in co1 4 of the table. TABLE SL No. I REQUIREMBNTS COSMETIC FOR ZINC STEARATE INDUSTRY REQUUUZXIWT FOR METHODOBTEST ( REP TO CL No. IN APF-J~NDIX A ) (4) A-2 A-3 A-4 A-5 A-8 (1) i) ii) (2) Zinc ( as ZnO ), percent by mass T$; of (3) 130 to 15-5 54 2 10 As agreed to between the purchaser and the supplier 4-O Shall not differ from zinc content by more than 05 3.0 1-O 9'0 separated fatty acids ( "C ), iii) Arseuic ( as As,O, ), ppm, Max iv) v) vi) vii) Heavy metals ( as Pb ), ppm, Max Sieve analysis Bulk density ) 1 Moisture, percent by mass, Max A-7 A-8 Total nsb, percent by mass ix) Iodine value of separated fatty MUX Frgafatty PH, Ma.v matter, percent by mass, A-9 A-10 A-11 4 xi) 3. PACKING AND MARRING 3.1 Packing - The size and material of construction of the containers shall be subject to agreement between the purchaser and the supplier. 3.2 Marking - The containers shall be securely closed and marked with the name and mass of the material in the container; manufacturer's name and trade-mark, if any; batch number in code or otherwise; and the year of manufacture. 4 IS : 2529 - 1984 3.2.1 The product may also be marked with Standard mark. 3.3 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 4. SAMPLING 41 Preparation of Test Samples the material 4.2 Number shall be prepared of Tests - Representative as prescribed in Appendix test samples B. of 4.2.1 Tests for the determination of zinc shall be conducted on each of the individual samples constituting the set of test sample ( see B-3.1.3 ). 4.2.2 Tests for the remaining characteristics, namely, sieve analysis, bulk density, moisture, total ash titre of separated fatty acids, iodine value of separated fatty acids, arsenic, heavy metals, free fatty matter, and PH shall be conducted on composite sample. 4.3 Criteria for Conformity and the range for .the test 4.3.1 For Individual Samples - The mean results for the determination of zinc shall be calculated as follows: Mean ( X) Rang 4.3.1.1 = the sum of the test results test results, and divided by the number and of the between the maximum ( R ) = the difference minimum value of the test results. The lot shall be declared to have than 15.5. satisfied 13.0, and the requirements for zinc if: a) X0.6 R is equal to or greater b) 2 + 0 6 R is equal to or less than 43.2 For Composite Sample - The test results on the composite sample shall meet the corresponding requirements specified in 2 and in Table 1. 5 II3 I 2520 - 1984 APPENDIX ( Claw? 2.2 ) A AbfALYSIS OF ZINC STBARATE FOR cosMETx INDUSTRY A-1. QUALITY OF REAGENTS A-l.1 Unless specified otherwise, pure chemicals and distilled water ( se6 IS : 1070-19778 ) shall be employed in the tests. NOTEPure chemicals ' shall mean which affect the results of analysis. chemicals that do not contain impurities A-2. DETERMINATION A-2.1 Reagents OF ZINC A-21.1 A-2.1.2 percent. A-2.1.3 A-21.4 of water. Concentrated Hydrochltiric Acid Ammtiium See IS : 265-1962t. 10 percent and 1 Hydrogett Phosphate Solution 50 percent ( v/v ). Dissolve Ethyl Alcohol - Methyl Red Indkator - 0.15 g of methyl red in 500 ml A-2.2 Procedure - Weigh accurately about 1 g of the material into a DO not heat latinum dish and ignite to light grey ash at 600 to 650°C. P anger than necessary. Cool and take up the ash in about 10 ml of water. Add methyl red indicator and neutralize with concentrated Bring to boil on a hot h drochloric acid and make up to about 200 ml. p rate and add 60 ml of ammonium hydrogen phosphate solution ( 10 percent ) and continue to heat at just below boiling for 30 minutes. Remove from the hot plate and allow to cool to room temperature. Filter through a tared Gooch crucible. Wash with freshly prepared ammonium hydrogen phosphate solution ( 1 percent ) and finally with 50 ml of ethyl Place the crucible in a porcelain crucible alcohol. Discard the filtrate. Increase the temperature and of suitable size and dry over a low flame. ignite at full heat to constant mass. *Specification f?Specification for water for general laboratory use ( second revision for'hydrochloric acid ( rroisti ). ). 6 A-2.3 Calculation Zinc ( as Z,O where m 1M I ACIDS ), percent by mass = q mass in g of the residue, mass in g of the material OF and taken for the test. A-3. DETERMINATION A-3.1 Reagents A-3.1.1 TlTItE OF SEPARATab FATTY Dilute Sulphuric Acid - 1 : 3. Ad.2 Procedure - Heat 50 g of the material with 400 ml of water and 50 ml of dilute eulphuric acids until the fatty acidr have separated a6 a layer. Wabh the fatty acids with boiling water until `free of sulphate. Warm the fatty acid6 on a steam-bath until the water is separated and the acid6 arc clear. Allow the acid6 to cool, melt and filter into a dry hot beaker and dry for 20 minutes at 100°C. Thsre the titre a6 directed fatty acids are also ured for test in A*9. Determine in 16 of IS : 266-1966*. A-4. TEST FOR ARSENIC A-4.1 Preparation of Solutioa - Place 1'000 g of the material .in a COOI platinum dish and incinerate for about 2 hours at 525 to 550°C. and treat with a mixture of 5 ml of concentrated sulphuric acid and 5 ml of concentrated nitric acid. Take to fumes on a hot plate, cool and make up the volume to exactly 100 ml. A-4.2 Take 10 ml of the solution of the material a6 obtained in A-4.1 and carry out the test for arsenic as prescribed in IS : 2088-1971t. Corn are the stain obtained with that produced by 0'000 2 mg of arsenic triox Pde ( As606 ). A-5.' TEST A-5.1 FOR HEAVY METALS Apparatus Nesster Cylindrrs 50 ml capacity. A&I.1 A-5.2 Reagents Concentrated Hydrochloric Acid Sor IS : 265.1962#. A-3.2.1 *Methods of sampling and test for soaps ( i;rJt r#OiJbn ). tMethods of the determination of arsenic ( Ji*sl w&ion ). Jspecification for hydrochloric acid ( ftiJed ). 7 IS: 2520 - 1984 A-5.2.2 A-5.2.3 A-5.2.4 Dilute Hydrochloric Acid Ammonium Chloride Acetic Acid - 1 : 1. 1 N. A-5.2.5 Standard Lead Solution - Dissolve I.60 g of Iead nitrate in water, add 1 ml of concentrated nitric acid ( See IS : 261-1968* ) and make up the volume to 1 000 ml. Pipette out 10 ml of solution and dilute again to 1 000 ml with water. One millilitre of this solution contains 0'01 mg of lead ( as Pb ). A-5.2.6 Hydrogen solution. &&hide Solution - Freshly prepared, saturated - Heat 0.500 g of the material in a silica crucible in A-S.3 Procedure a muffle furnace at 475 to 500°C. Cool and treat the residue with 3 drops of concentrated hydrochloric acid. Evaporate to dryness over a low flame and heat again in the furnace for 20 to 30 minutes. A clean white ash should result, otherwise, the treatment may be repeated. Dissolve the white ash in 1 ml of dilute hydrochloric acid and wash with several portions of water into an evaporating dish. Evaporate to dryness on steam bath and dissolve the residue in about 30 ml of water. Transfer the solution to a Nessler cylinder and add 1 g of ammonium chloride and I ml of acetic acid. Carry out a control test in another Nessler cylinder using 0.5 ml of standard lead solution in place of the material. Add 1 g of ammonium chloride and 1 ml of acetic acid to each Nessler cylinder add 10 ml of hydrogen sulphide solution, dilute to the mark and shake well. Compare the intensity of colour produced in the two cylinders. A-5.3.1 The limit prescribed in Table 1 shall be taken as not having been exceeded if the intensity of the colour obtained with the material is not greater than that obtained in the control test. A-6. DETERMINATION DENSlTY A-6.1 Sieve Analysis OF SIEVE ANALYSIS AND BULK A-6.1.1 Procedure - Place about 10 g of the material, accurately weighed, in the agreed sieve and wash by means of a slow stream of running tap water ( see Note 1 ) and finally with fine stream from a wash bottle until all the material that is capable of passing through the sie.ve has passed ( see Note 8 ). Let the water drain from the sieve and then dry the sieve contaming the residue on a steam-bath. If there is any *Specification for nitric acid (JFrsr reuision). 8 IS : 2520 - 1984 residue, carefully transfer it on to a tared watch-glass and dry to constant mass at 105 f 2°C. NOTE I-Tap water is usually sufficiently free from suspended particles to be utilized directly as i&_comesfrom the faucet. If the water is turbid, it is necessary to place a large bottle of&&d water above the working sink and to siphon the water through a clean rubher tube to the level of the sieve. It is a good plan to insert a small rubber stopper carrying a short glass tube about 5 cm in length and W6 cm in internal diameter in the faucet outlet. A thin flexible piece of clean rubber tubing ( new tubing should first be thoroughly washed ) about 60 cm in length is then attached to the glass tube. The faucet is turned [on slowly until a thin stream of water is coming through the rubber tube. By processing the end of the rubber tube between the fingers, the steam of water can be varied in intensity and directed to any section of the sieve. Experience has shown that the best practice is to alternately tip the sieve from one side to another, washing the sample from the higher level of the sieve to the lower and then reversing the sieve and repeating the operation. NOTE 2 - In order to obtain comparable results, it is essential to continue washing the residue on the sieve until one is satisfied that all the material fine enough to pas through the sieve has been removed. At least one-half hour of washing is essential in most cases. It is a good plan to catch the last washes in a beaker. By viewing the contents of the beaker against a dark coloured background, it is possible to accurately gauge the progress of the washing operations. A-6.1.2 Calculation Material retained on the specified sieve, percent by mass ~ 1OOm M where m = mass in g of the residue retained on the specified sieve, and M =- mass in g of the material taken for the test. A-6.2 Bulk Density A-6.2.1 Apparatus A-6.2.1.1 Assemble the apparatus as shown in Fig. 1. The base of measuring cylinder A shall be ground flat and the emply measuring cylinder A together with the rubber bung shall weigh 250 f 5 g. It shall be accurately calibrated to 250 ml with an error, if any, of less than one millilitre. The distance between zero and 250 ml graduation on the measuring cylinder A shall be not less than 220 mm and not more than 250 mm. The distance between the flat-ground part of the base of measuring clyinder A and the rubber base pad B, when the measuring cylinder A is raised to full height shall be 25 f 2 mm. A-6.2.1.2 Rubber base pad - The rubber base pad B shall have a shore hardness of 42 to 50. A-6.2.1.3 Balance - Pans of the balance shall be at least 10 cm in diameter and the balance shall be sensitive to less than 0.1 g. through A-6.2.2 Procedure - Sieve about 40 g of the material 250 micron IS Sieve on to a tared glazed paper and weigh it accurately. 9 15:2520-1984 Slip the powder gently and smoothly into the measuring cylinder which should be held at 45" to the vertical, without knocking or squeezing. Assemble the apparatus as shown in Fig. 1. With the thumb and four fingers of one hand, gently grasp the upper part of cylinder and within one second, lift it about 25 mm ( takihg care not to jerk the cylinder by knocking it against the upper stop ) and let it drop. Note the volume after dropping it once. Continue lifting and dropping 50 complete drops have been given to the cylinder. During this operation, give a gentle turn of about 10" in the clockwise direction to the cylinder afier every two drops. As soon as 50 drops are completed, raise the cylinder to eye level and read the volume of the material. AI1 dimensions in milHmetres. APPARATUS FOR DETERMINATIONOF BULK DENSITY FIQ. 1 A-6.2.3, Calculation Bulk density, g/ml: a) After one tap b) After 50 taps where m = mass in g of the material taken for the test, Va = volume in ml of the material after one tap, and Vg = volume in ml of the material after 50 taps. 10 F 1 -F .n IS : 2529 - 1984 A-7. DETERMINATION OF MOISTURE A-7.1 Procedure - Weigh accurately about 3 g of the material and dry in an oven at 105 f 2°C for 3 hours and weigh to constant mass. A-7.2 Calculation Moisture, percent by mass where = 100 MI - M2 Ml = loss in mass in g on drying, and MS = mass in g of the material taken for the test. A-8. DETERMINATION OF TOTAL ASH -A-9.1 Procedure - Weigh accurately about 1'5 g of the material in a platinum dish and gently heat until the organic matter is burnt away. Increase the temperature to about 550°C until all carbon residue is Allow to cool and weigh. Repeat the operation of heating, burnt away. cooling and weighing until constant mass is obtained. A-0.2 Calculation Total ash, percent by mass _ where lOO& M2 Ml = mass in g of the ash, and M2 = mass in g of the material A-9. DETERMINATION FATTY ACIDS OF IODINE taken for the test. VALUE OF SEPARATED A-9.1 Procedure - Weigh accurately about 3.0 g of the fatty acids as obtained in A-3.2 and determine iodine value by Wijs method as directed in 18 of IS : 286.1966*. A-10. DETERMINATION A-10.1 Reagent A-10.1.1 EthTl Ether OF FREE FATl'Y MATTER set IS : 336-1973t. A-10.2 Prpcedurc - Weigh accurately about 5 g of the material and Shake for about half an hour mix it with 100 ml of ether in a beaker. *Methods of sampling and tat for soap0 (fir: r&ion ). tspecification for ether ( aond rmisien ). 11 IS : 2528 - 1984 . and filter. Take the filtrate in a tared porcelain dish and evaporate slowly on a steam-bath. Cool and weigh the residue. Calcolation 100 Ml Ma A-10.3 Free fatty matter, percent by mass = where Ml = mass in g of the residue, and Ma - mass in g of the material taken for the test. A-11. $3 DETERMINATION A-11.1 Apparatus pH Meter A-11.2 Procedure - Weigh about 2 g of the material and wet it with 5 ml of neutralized ethyl alcohol and 45 ml of water. Filter the susDension through G 3 sintered glass funnel and determine the pH of the filtrate at 27°C. APPENDIX ( Clause 4.1 ) PREPARATION B-I. GENERAL B STEARATE OF TEST SAMPLES OF ZINC FOR COSMETIC INDUSTRY REQ-MENTS OF SAMPLING B-1.0 In drawing, preparing, storing and handling test samples, the following precautions and directions as directed in IS : 8883 ( Part 1 )1978* shall be observed. B-2. SCALE OF SAMPLING B-2.1 Lot - All the containers in a single consignment of the material drawn from a single batch of manufacture shall constitute a lot. If a consignment is declared or known to consist of different batches of manufacture, the containers belonging to the same batch shall be grouped together and each such group shall constitute a separate lot. B-2.1.1 Samples shall be tested from each lot for ascertaining conformity of the material to the requirements of this specification. mentsand precautions. *Methods of sampling chemicals and chemical products: Part 1 General require- 12 IS:2520-1984 B-2.2 The number depend of containers ( n ) to be chosen from the lot shall on the size of the lot ( .N) and shall be as given in Table 2. 2 NUMBEB LOTSIZE N (1) up TABLE OF CONTAINERS TO BE SELECTED BE FOR SAMPLING SELECTED NO. OB COXTMNRRS TO n (2) 51 151 301 501 50 to 150 to 300 to 500 and above to 3 4 5 7 IO B-2.3 The containers to be selected for sampling shall be chosen at random from the lot and for this purpose random number tables ( see IS : 49051968; ) shall be used. In case such tables are not available, the following procedure may be adopted: Starting from any container, count them 1, 2, 3 ,...... . . . . r and so on in a systematic manner, where r is the integral part of N/n. Every rth container thus counted shall be withdrawn from the lot. B-3. TEST SAMPLES AND REFEREE of Test Samples SAMPLE B-3.1 Preparation B-3.1.1 Draw with an appropriate sampling instrument a small portion of the material from different parts of each container selected ( see Table 2 ). The total quantity of the material drawn from each container shall be sufficient to conduct the tests for all the characteristics given under 2 and shall not exceed 1 kg. B-3.1.2 Thoroughly mix all portions of the material draw'n from the same container. Out of these portions, equal quantity shall be taken from each selected container and shall be well mixed up together so as This composite to form a composite simple weighing not less than 1 kg. sample shall be divided into three equal parts, one for the purchaser, another for the supplier and the third for the referee. B-3.1.3. The remaining portion of the material from each container ( after the quantity needed for the formation of composite sample has been taken ) be divided into three equal parts, each part weighing not less than 100 g. These parts shall be immediately transferred to thoroughly dried bottles which are then sealed air-tight with stoppers and labelled with all the particulars of sampling given under B-1.0. *Methods for random sampling. 13 lSt2520-19s4 The material in each such sealed bottle shall constitute an individual test sample. These individual samples shall be separated into three identical sets of samples in such a way that each set has an individual test sample representing each container selected. One of these three sets shall be sent to the purchaser, another to the supplier and the third shall be used as referee sample. B-3.2 Referee Sample - The referee sample shall consist of the composite sample ( see B-3.1.2 ) and a set of individual samples ( SIC B-S.13 ) marked for this purpose and shall bear the seals of the purchaser and the supplier. These shall be kept at a place agreed to between the purchaser and the supplier and shall be used in case of dispute between the two. 14 BUREAU OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg. NEW DELHI 110002 Telephones: 323 0131, 323 3375, 323 9402 Fax : 91 113234062, 91 113239399, 91 113239382 Telegrams : Manaksanstha (Common to all Offices) Cenfra! Laboratory: Plot No. 2019, Site IV, Sahibabad RegIonal OtYRws: Cer~tral `Eastern Northern Southern Industrial Area, SAHIBABAD 201010 Telephone 8-77 00 32 : Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 : 1114 CIT Scheme VII M, V.I.P. Road, Maniktola. CALCUTTA700054 : SC0 331336, Sector 34-A, CHANDIGARH 160022 323 76 17 337 86 62 60 38 43 235 23 15 832 92 95 : C.I.T. Campus, IV Cross Road, CHENNAI 600113 tWestern : Manakalaya, ES Behind Mar01 Telephone Exchange, Andheri (East), MUMBAI 400093 Bmnch Offkes: `Pushpak', Nurmohamed Shaikh Marg, Khanpur. AHMEDABAD Road, 380001 5501348 839 49 55 55 40 21 40 36 27 21 01 41 8-28 66 01 8-71 19 96 54 11 37 20 10 83 37 29 25 21 68 76 23 89 23 26 23 05 6 21 17 +Peenya Industrial Area, 1st Stage, Bangalore-Tumkur BANGALORE 560058 Gangotri Complex, Plot No. 62-63, 5th Floor, Bhadbhada Road, T T. Nagar. BHOPAL 462003 751001 641037 121001 Unit VI. Ganga Nagar. BHUBANESHWAR Road, FARIDABAD 201001 Kataikathir Buildings. 670 Avinashi Road, COIMBATORE Plot No. 43, Sector 16 A, Mathura Savifri Complex, 5-8-58C, 116 G. T Road, GHAZIABAD 53/5 Ward No. 29. R. G. Barua Road, 5th By-lane, L. N. Gupta Marg, Nampally Marg, C-Scheme, Nagar. KANPUR E-52, Chitaranjan JAIPUR 302601 GUWAHATI 781063 500001 Station Road, HYDERABAD 208005 117/418 B. Sarvodaya Se&B@wrn~,2nd FJoor, Behind Leela Cinema, Naval Kishore Road, LUCKNOW 226601 Patliputra Industrial Estate, PATNA 806013 P. 0. Pafayam, 695034 440010 T. C. No. 14/1421, University THIRUVANANTHAPURAM Institution of Engineers NIT Building, Second Floor, Gokulpat Market, NAGPUR 52 51 71 32 36 35 ( India ) Building, 1332 Shiiaji Nagar, PUNE 411005 Approach, P 0. Princep Street, `Sates Offtce is at, 5 Chowringhee CALCUTTA 706672 TSales Office is at Novelty 27 10 85 Grant Road, MUMBAI 400007 309 65 28 222 39 71 Square, Chambers, *Sales Office is at `F' Block. Unity Building, Narashimaraja BANGALORE 560002 PrInted at New India Prfnting Press, Khurfa. India NO. 1 DECEMBER 1995 TO IS 2520 : 1984 SPECIFICATION FOR ZINC STEARATE FOR COSMETIC INDUSTRY ( Second Revision ) [ Page 4, Table 1, SINo. (i), coZ3 ] -Substitute `12.5 to 14.5' for `13.Oto 15.5'. AMENDMENT ( Page 6, clause A-2, Determination of Zinc ) for the existing: Substitute the following `A-2.1 Reagents A-2.1.1 Sulplluric Acid - 0.1 N. A-2.1.2 Strong Ammonia - Ammonium Chloride solution - Dissolve 67.5 g of Ammonium Chloride in 740 ml of Ammonia solution (25% w/w) and add sufficient water to produce 1000 ml. A-2.1.3 Erichome Black T Solution - Dissolve 0.20 g of Erichrome Black T and 2 g of Hydroxylamine hydrochloride in sufficient methyl alcohol to produce 50 ml. This solution must be freshly prepared. A-2.1.4 Standard Disodium Ethylenediamine Tetra Acetate Solution - 0.05 M. A-2.2 Procedure - Weight accurately about 1 g of material and boil with 50 ml of O.lN Sulphuric acid until the fatty acid layer which separates is clear, adding mote water as necessary to maintain the original volume; cool and filter. Wash thoroughly with water until the last washing is not acid to litmus paper. Add to the combined filtrate and washings, 15 ml of strong Ammonia Ammonium Chloride solution and 0.2 ml of Erichrome Black T Solution. Heat the solution to about 40°C and titrate with 0.05M Disodium Ethylenediamine tetra acetate until the solution is deep blue in colour. A-2.3 Calculation Zinc as ZnO, percent by mass = where 8.138xVx M m V = volume in ml of Disodium Ethylenediamine tetra acetate solution, M = molarity of Disodium Ethylenediamine tetra acetate solution, and m = weight of the material in g. (PCD19) Rinted atNew India Rintins Press. Khurja. India _